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Outboard won't run without choke engaged

mmk007's Avatar
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05-17-05, 12:24 PM   #1  
Outboard won't run without choke engaged

This year when I put my 1998 Johnson 8 hp outboard on my boat it started just as it always does by pulling out the choke and giving a healthy yank or two. However, after a minute or two of running when I disengage the choke, the engine stalls. I thought this might just be due to some of the fogger being left in the cylinders, so I put it in the water and took it out for a run. The fact is that it simply will not continue to run at any speed unless the choke is partly engaged. If I have it fully engaged, the engine chokes out (as expected) and if I am running at any speed and I push the choke all the way off, the engine stalls. With the choke pulled out (engaged) about 1/4 of the way the engine will continue to run at all speeds. I do not detect that the engine has any less power than it has in the past. I have hesitated to mess with the idle and high speed jets because the problem exists at all speeds. Any hints?

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toddlee's Avatar

Join Date: May 2005
Posts: 1

05-17-05, 02:21 PM   #2  
Time for a carb cleaning

Your problem is most likely due to stopped up carbs. I had the same problem on my 200 HP Evinrude. After changing plugs, fuel filter and lots of head scratching I took it into the shop. The problem was stopped up carbs and fuel jets. It is a common problem and I did notice you mentioned that you had fogged your engine before storage. That is supposed to eliminate this problem but it is not always the case.

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